This fellow Virginian welcomes you. I shoot at a new range near Richmond. I've enjoyed a bunch of Kahrs over many years.
The S series is most similar to the C series as well to all other Kahrs in that the overall design is the same in all of the polymer guns. The S series differs only in the three dot sights, front serrations, reversible mag release, and accessory rail that are unique to the S series only.
Construction; rails, slides, trigger, etc. remain the same.
I have never had a problem loading by slingshot or lever method with any of the eight Kahrs I've owned. One does have to remember not to ride a Kahr slide. That may cause problems. You must let the spring do the work at full speed. The Lakeland followers help in this IMHO.
The guns are all accurate enough. Either barrel cut will do. I personally like polygonal barrels because they are easier to clean. Otherwise I don't much care.
Don't know about holsters. I would guess the accessory rail rules out some holsters.
If I were choosing between the S or P series, I 'd like the three dot sights and rail of the S. I'd like the barrel, available in all black feature, steel sights and third mag of the P series. If I planned to carry the gun I'd upgrade sights anyway. A laser is available for either model. Personally, I'd go with a P if I'd carry or the S if it's only a range gun and save a few bucks.
Judging by today's left wing, looks like Senator Joe McCarthy was right after all.